edac: ibecc: Return -ENODATA on zero log

Return -ENODATA when we read zero log.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>

drivers/edac/edac_ibecc.c

@@ -198,6 +198,9 @@ static int inject_error_trigger(const struct device *dev)
 static int ecc_error_log_get(const struct device *dev, uint64_t *value)
 {
 	*value = ibecc_read_reg64(dev, IBECC_ECC_ERROR_LOG);
+	if (*value == 0) {
+		return -ENODATA;
+	}
 
 	return 0;
 }
@@ -214,6 +217,9 @@ static int ecc_error_log_clear(const struct device *dev)
 static int parity_error_log_get(const struct device *dev, uint64_t *value)
 {
 	*value = ibecc_read_reg64(dev, IBECC_PARITY_ERROR_LOG);
+	if (*value == 0) {
+		return -ENODATA;
+	}
 
 	return 0;
 }

tests/subsys/edac/ibecc/src/ibecc.c

@@ -58,13 +58,13 @@ static void test_ibecc_api(void)
 	/* Error log API */
 
 	ret = edac_ecc_error_log_get(dev, &value);
-	zassert_equal(ret, 0, "edac_ecc_error_log_get failed");
+	zassert_equal(ret, -ENODATA, "edac_ecc_error_log_get failed");
 
 	ret = edac_ecc_error_log_clear(dev);
 	zassert_equal(ret, 0, "edac_ecc_error_log_clear failed");
 
 	ret = edac_parity_error_log_get(dev, &value);
-	zassert_equal(ret, 0, "edac_parity_error_log_get failed");
+	zassert_equal(ret, -ENODATA, "edac_parity_error_log_get failed");
 
 	ret = edac_parity_error_log_clear(dev);
 	zassert_equal(ret, 0, "edac_parity_error_log_clear failed");